Bone Adams is a legend, the best mortician in the spires. When a new killer begins leaving bodies twisted and bent into grotesque pieces of art, City Officer Stark tasks Bone to unravel the clues. As more victims are discovered, Bone and Stark are drawn deeper into a world where pain and personal statement blend and blur, and finally end up hunting for a semi-mythical man-machine named Burneo deep within the sewers.
But things aren't what they seem. While searching for Burneo, Bone and Stark discover a hidden lab full of evidence of horrific abuses of science and experimentation. Meanwhile, the killer is still on the loose, and, as Stark becomes more and more obsessed with the case, Bone is forced to a shattering realization. Everything is connected: the killings, the gang activity, the labs, and his own past. Unless he can figure out how, he won't survive.